A recent study published in the British Medical Journal found that sunlight boosts testosterone by stimulating the hypothalamus – part of the brain responsible for hormones.
“Our body clock dictates our circadian rhythms which govern our mood and energy levels.” Even before a man has opened his eyes in the morning, his level of testosterone is at its peak – between 25 percent to 50 percent more than at any other time of the day. “The raised levels in the morning mean most men will wake up two to three times a week with erections,” said Ashley Grossman, neuroendocrinology professor at St Bartholomew’s Hospital, London.